Mosquito season in Buena Vista County, IA: when it starts and ends
Mosquito months in Buena Vista County
In a normal year mosquito season in Buena Vista County, IA starts around April 22 and ends around October 15, about 25 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Buena Vista County, and when
- Start tipping out standing water weekly by April 8.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 15.
- 2 West Nile cases since 2016 (last 2022): you should use repellent at dusk July to August, more so if over 60.
Buena Vista County against the rest of IA
Buena Vista County has the 61st longest season of 99 IA counties, at 176 days against 198 in Des Moines County and 160 in Worth County. Its mean temperature is 46.8°F.
- Wright County: April 22 to October 16 (177 days, 1 WNV)
- Sioux County: April 21 to October 14 (176 days, 32 WNV)
- Butler County: April 22 to October 15 (176 days, 1 WNV)
- Grundy County: April 22 to October 15 (176 days, 2 WNV)
West Nile in Buena Vista County
From 1999 to 2025, CDC ArboNET counted 5 human West Nile cases in Buena Vista County (4 neuroinvasive) across 4 years. The worst was 2003 with 2; the latest was 2022.
Background: when the season starts across the US; how the dates are worked out.